solution

app/main.py

@@ -1,34 +1,109 @@
 class Deck:
-    def __init__(self, row, column, is_alive=True):
-        pass
+    def __init__(self, row: int, column: int, is_alive: bool = True) -> None:
+        self.row = row
+        self.column = column
+        self.is_alive = is_alive
 
 
 class Ship:
-    def __init__(self, start, end, is_drowned=False):
-        # Create decks and save them to a list `self.decks`
-        pass
+    def __init__(
+        self,
+        start: tuple,
+        end: tuple,
+        is_drowned: bool = False
+    ) -> None:
+        self.is_drowned = is_drowned
+        self.decks = []
+        if start == end:
+            self.decks.append(Deck(start[0], start[1]))
+        elif start[0] == end[0] and start[1] != end[1]:
+            for num in range(end[1] - start[1] + 1):
+                self.decks.append(Deck(start[0], start[1] + num))
+        else:
+            for num in range(end[0] - start[0] + 1):
+                self.decks.append(Deck(start[0] + num, start[1]))
 
-    def get_deck(self, row, column):
-        # Find the corresponding deck in the list
-        pass
+    def get_deck(self, row: int, column: int) -> Deck:
+        for deck in self.decks:
+            if deck.row == row and deck.column == column:
+                return deck
 
-    def fire(self, row, column):
-        # Change the `is_alive` status of the deck
-        # And update the `is_drowned` value if it's needed
-        pass
+    def fire(self, row: int, column: int) -> bool:
+        deck = self.get_deck(row, column)
+        if not self.is_drowned and deck.is_alive:
+            deck.is_alive = False
+            for deck in self.decks:
+                if deck.is_alive:
+                    return self.is_drowned
+            self.is_drowned = True
+
+        return self.is_drowned
 
 
 class Battleship:
-    def __init__(self, ships):
-        # Create a dict `self.field`.
-        # Its keys are tuples - the coordinates of the non-empty cells,
-        # A value for each cell is a reference to the ship
-        # which is located in it
-        pass
-
-    def fire(self, location: tuple):
-        # This function should check whether the location
-        # is a key in the `self.field`
-        # If it is, then it should check if this cell is the last alive
-        # in the ship or not.
-        pass
+    def __init__(self, ships: list[tuple[tuple, tuple]]) -> None:
+        self.field = {}
+        for ship in ships:
+            current_ship = Ship(ship[0], ship[1])
+            for deck in current_ship.decks:
+                self.field[(deck.row, deck.column)] = current_ship
+
+    def fire(self, location: tuple) -> str:
+        if location in self.field:
+            sunk = self.field[location].fire(*location)
+            return "Sunk!" if sunk else "Hit!"
+
+        return "Miss!"
+
+    def _validate_field(self) -> None:
+        ships = set(self.field.values())
+        if not (
+            len(ships) == 10
+            or self._validate_ships_count
+            or self._validate_ship_location
+        ):
+            raise InvalidBattleshipField(
+                "Incorrect ship coordinates in the passed list"
+            )
+
+    def print_field(self) -> None:
+        empty = [["~" for _ in range(10)] for _ in range(10)]
+        for ship in set(self.field.values()):
+            marker = "*"
+            if ship.is_drowned:
+                marker = "x"
+            for deck in ship.decks:
+                if deck.is_alive:
+                    empty[deck.row][deck.column] = u"\u25A1"
+                else:
+                    empty[deck.row][deck.column] = marker
+        filled_field = ""
+
+        for row in empty:
+            filled_field += "\t".join(row) + "\n"
+
+        print(filled_field)
+
+    def _validate_ships_count(self) -> bool:
+        ships_count = [0, 0, 0, 0]
+        for ship in set(self.field.values()):
+            ships_count[len(ship.decks) - 1] += 1
+        return ships_count == [4, 3, 2, 1]
+
+    def _validate_ship_location(self) -> bool:
+        directions = [
+            (-1, -1), (1, 1), (-1, 0), (0, -1),
+            (-1, 1), (1, -1), (1, 0), (0, 1),
+        ]
+
+        for (row, column), ship in self.field.items():
+            for dr, dc in directions:
+                adjacent = (row + dr, column + dc)
+                if adjacent in self.field and self.field[adjacent] != ship:
+                    return False
+
+        return False
+
+
+class InvalidBattleshipField(Exception):
+    pass